Rotary abrading strip holder



Oct. 6, 1953 LYNCH 2,654,192

\ ROTARY ABRADING STRIP HOLDER Filed June 2, 1952 IN VEN TOR.

7 IL..LYNCH ATTORNEY.

Patented Oct. 6, 1953 UNITED STATES PATENT OFFICE ROTARY ABRADING STRIP HOLDER Lawrence Lynch, Los Angeles, Calif.

Application June 2, 1952, Serial No. 291,119

' 3 Claims.

This invention relates to abrading and hiding rollers such as used for polishing the tools in which plastic articles are molded. Such polishing is generally a very delicate operation which requires expert handling of a perfectly balanced buffing tool.

It is in view of the foregoing the object of my invention to provide'a simple and inexpensive tool which is'so perfectly balanced that it can be depended upon for the most delicate polishing operations 'at the very high speed of rotation of such tools. Another object of the invention is to provide a device in the form of a roller whereon a flexible strip of abrasive material may be mounted and which includes means for drawing the strip of material tightly; and evenly about the roller. These and other objects of the invention as well asthe manyadvantageous features thereof will be better understood upon perusal of the following detailed description and by referring to, the accompanying drawing in which preferred forms of the invention are illustrated.

In the drawing:

Fig. 1 is an end view of a buffing roller embodying the invention;

Fig. 2 is a substantially corresponding side elevational view of the device;

Figs. 3 and 4 illustrate the element of the invention by means of which a strip of abrasive material may be tightly supported on the roller, substantially in the manner indicated in Fig. 1; and

Figs. 5, 6 and '7 illustrate a modified form of the invention.

The roller shown in Figs. 1 and 2 comprises .a cylindrical core I to the peripheral surface of which a soft resilient lining 2 is rigidly secured. The roller is shown mounted on a spindle 3 for insertion into the jaws of the machine ordinarily employed to rotate the roll at high speed.

A passage 4 extends axially through the case of the roller and a slot 5 is cut into the surface of the roller leading into this passage of a size to admit the ends of a strip A of an abrasive material into the passage. The inner surface of the passage is threaded to receive therein a threaded strip tightening element 10. A transverse slot l l is cut into this element from one end thereof and of a depth and width to receive'therein the ends of the abrading strip A and a thin disc I2 is seated in the open end of the element rigidly to maintain the shape of the element undisturbed during the operation of the device.

It is important to note that an arcuate recess 6 is cut into the inner surface of the passage 4 sition on the roller. In order to perform this operation, it is merely required to advance the element into the passage 4 until the slot H is in axial alinement with the slot 5 of the roller. I The strip of abrasive material is then folded about the roller end the ends of the strip pushed through the slot of the roller into. the slot of the element until the strip fits snugly about the roller. When thereupon the elementisrotated in the direction of the arrow of Fig. 2, it is found that the layers of the strip will be forced into the recess 6 tightly to clamp the strip in position on the roller. It was above stated that the'polishing to be performed is a delicate operation requiring a very light perfectly balanced tool. The core I of the roller is for this reason made from very light, soft material, such as aluminum. But because the tightening element is of tenuous construction and is subjected to considerable strain in clamping the lining in position on the core, it becomes necessary to employ much stronger material, such as steel or bronze, and since such material is so much heavier, it is found that the weight of the tightening element will urge the roller out of balance when rotated at high speed. Some means must be provided to overcome this difliculty and I have found that cutting holes of the proper diameter axially into or through the core and as close to the tightening element as possible, substantially as indicated at IS in Fig. 1, perfect balance may be restored.

The modified form of device illustrated in Figs. 5 to '7 differs from the foregoing merely in the manner in which the element 20 is held against axial displacement within the passage I6 of the roller. v

The outer cylindrical surface of this element and the inner surface of the passage l6 are both smooth and of a size snugly to seat the element therein. The means for maintaining the element axially in position within the passage includes a pin 2| which is seated in the roller to project into an annular groove 22 of the element. Once the element has been in such manner applied to the roller, it is merely required to rotate the element, in the same manner that .the element I0 is rotated, tightly to clamp the strip in position on the roller.

Means should be provided for facilitating rotation of the elements, and such means is in Fig. 1 shown totake the form of a hexagonal recess M in the end of the element and of a size to re- 3 ceive therein a suitable key. If preferred, a slot 23 may be cut in the end of the element, as indicated in Fig. '7 for receiving an ordinary screw driver.

I claim:

l. A support for a strip of material comprising, a roller having a threaded cylindrical passage axially therethrough near the outer surface thereof, the portion of the roller between the passage and thesurface of .the roller being cut to provide a slot'leadfing into the axial center of the passage and of a width to admit therethrough the ends of the strip to be supported, a threaded cylindrical strip tightening element extending through and fitted to rotate the threadsuof said passage, the element having .aslot-axially sunk into one end thereof for alinemen't with the roller slot to receive therein the ends .ofizthezstrip fed through the roller slot, there being anarcuate recess in the threaded wall of the passage adjacent one edge of the roller slot of a depth to receive therein "the layers of the-strip when the element is rotated to force the layers of the strip iitto'sa id recess, and -a thin spacing disc rigidly seated *inf'the slot or the element at the en'ter endthereof.

2. A support foras trip ofmaterial comprising, a very light roller having a cylindrical passage axially therethrough near the outer surface thereof, theportion of the roller between the passage and the surface of the roller being 'cut to provide a slotileadin'g' into the axial center cf the passage and of a width 'to'admit therethrough the ends'of the strip to at supported, and a cylindrica-I strip tightening element extending through and fltted to rotate within said passage, said elementbeingmade from muc'h'heavier and stronger material, theelement 'havinga slot axially sunk into one end thereof for a-l-inement with-the roller slot "to receivetherein the ends'oi the strip fed through-the roller slot, there being an arcuate recess the wall of 'thepassage adjacent one edge brthe'rol'ler slot ofa depth;to receive there- "in. the layers or the strip when the element "is rotated to force the'iayers of thestr'ip into said recess, there being passages axially through the roller near the cylindrical passage therethrough of the proper diameter to reduce the weight of the roller about the element sufilciently to balance the roller.

3. A support for a strip of material comprising, a very light roller having a cylindrical passage axially therethrough near the outer surface thereof, the portion of the roller between the passage and the surface of the rpller being cut to provide a :slot leadingtmtothemxial center of the passage and of a width to admit therethrough the ends of the strip to be supported, a cylindrical strip tightening element extending through and fittedto -mtate within said passage, said element heiugmade from much heavier and stronger material, the element having a slot axially sunk :into home end thereof for alinement with the roller ,slot to receive therein the ends of the strip fed through the roller slot, there being an arcuate recess in the .wall of the passage adjat nt Dne dge oi the rollerslot of a depth toxeceive therein the jlayers offlthe strip when; the e'len'ierrtis rotatedtoiorcethe layers of the strip into said recess, there being passages axially through the roller near the cylindrical hrqu 0f he p r d m rtc li ht n roller about the elementsufficiently to ibaiance the roller, anda spacer rigidly seated the slotoftheelement atthe open end thereof.'

References Cited in the ifile er "this patent unripe emer es manners,-

Number Name 7 Date 176,298 Greene Apr. 18,1826 565,683 Stuboe 'S8pt. 26, 1893 603357 Bagley MayB, 1898 863,276 Hobby Aug. 13,

1,631,798 Davol time 7,, 1'92? 2,424,167

Hillquist Q 15;. f1 945' 

